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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dab0556291b24c715a2d7346a3ea7b5ed05e26460de439f236c14bef967ea9c8' 
  AND token = 'HIrfTwe1AC1Vezv6bvnC+D4Ti1s9a/3RQPuCeQInhA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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