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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10142ea547daf421a09a42e298c3e75bc6b764a1ed8e11655cc41d650066bebf' 
  AND token = 'WlRr0Pn+8PJR7aEu6HZQh0/meZNae+guEpiKkSMQieM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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