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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a46a1a10c8ce947ab1b81c1137b1a5e38b9d4d76772331e7b9d1b6f7f18db407' 
  AND token = 'MhUj9cp4K6bWNx8XUxolGml+vqR+/iaMHln8tBwtR8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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