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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e455716fb72f42cf21f51d9c6a03fcc98901a4a17ea9d9084220f94daef62cec' 
  AND token = 'eqflEsljEdeTPpjJ7bFH9kXSDQ6ioZgTgHxpETxIYG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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