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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '624e73a2d2d81039a19ed5fcdd9bfeec5312a0e211734d200c4c27ff33ec2cd8' 
  AND token = 'mKDSaLpJMLnb1F1jec/pmBsXQmftFx+AAqHpDhQe0mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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