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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7d801be4e030898fd90eb888dafec8b88bcc746772538d3017130997faf39cf' 
  AND token = 'ghQZzPYitU2890XWCZHiVJxhzd2HkKSomTH9pR+va3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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