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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba91680b656799600d953c35b8dcfd4677b05d4f0d4683793c1826429eb156fb' 
  AND token = '0rnX4s3U7sXHDEtiOhRI3ojpaIgfedlk1/csx3Wnr3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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