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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b53d0a4c21c518becbfffe77d1cf51301a6bc88038d2850bb2dc01e65273078' 
  AND token = 'e0TSeovM7MNFpQj7H6wtYS2j7M8FMlR6Lzu+yuHcki0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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