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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3757c5237067fa3e4ad9c1e34fe5e8da656d6faec6528eacbdb6462deb4e247b' 
  AND token = 'dE1eI1gvjMg9iK0r6Sf+tnGr9qEWchn+IBEZbB6piyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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