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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18c7b040bf210e18685fe051174f324e8cba8de4dd655ef2ef0a29a7425e5f0b' 
  AND token = '573Rt4Su/IFHRTiF3kd4MEOtyKI5AWKo6CXQHq/d4mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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