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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26c0a82a4312939313517248dbf1672f3dc122b13ecc2545d3ef37fbcde22ecf' 
  AND token = '0z2rz9ZHwIuD5uQt55w8PAJKMs61l2nnaW6uKksgdsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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