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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ce32c2df723e711acff5dba6cca6f2c5967fff08b302a6fe33c865dfe122b22' 
  AND token = 'xhB6UFIMUGGMIOZTd3Usitv3wHP6/+ocymYmtf4a5ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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