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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0f599f634c6b3e7ad126531cee71341efa8cb04ddce414eff63eafd91e61268' 
  AND token = 'O8ijjXZ0LyXhNiFVy4uq+W3c0ywDx2k4ZMHFw1puAyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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