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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d7c8b214d511f9c1820b13b0b6dd36b925af11d9016874575038013b0afd8fe' 
  AND token = '3weQGbcQWe4HotVy8VK5ALfy96aeQof8bmtjr1lxcKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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