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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecd3585a8f414548f11d5e4e0cb5908470d31efbf829313906e84b8ede123a19' 
  AND token = 'F0ZklBsxelSc4EVYHx98tNRzoiTElhEcGqZ3G28p6Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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