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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b3e147f82b3fb99bc7c73d8a869a4f50fa3c4d7aabf6d1a8d6f0f7aeb45ac2c' 
  AND token = 'NCX1nhNQHecAyhfOU3pTSo5HcGkk7s54LHneSRrA+WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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