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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62b39175b92c710c0f63c484e6ab9c46461268c73347c736a0bacef02e28db62' 
  AND token = 'W5gKXjyd3Ks9/s9BRsM5a+stpvV2p1lYVVez441kDys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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