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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b61aa8b6f6fc627ff6d7ab70fb908a6fcafeaa61734187289c72aff5062c6397' 
  AND token = 'JoNgfWDBeWmFK+yQEoSAFR/QYR4hkCOHHcLljyVA0N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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