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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab7ca6284f57433b9858aab0dc0d41543a381cf53490a93b8258b1ea3444996b' 
  AND token = 'xlIZLvFkq9bwb/BjmFGZ8wrk0kA1jNwTLbqcFyT+BS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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