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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1db4233bda7cf7fb66e6c7abc699da287f1b4a217609ab45b8c0c4b93aefe2f5' 
  AND token = 'BcnnnTWtUEgMr0z5AikPDx0Pyzjc3kHqFScq0/a1i/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}