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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04d13f5f68346aeb49990a9caa7ce635086c547f797da74f11f92b8116b52388' 
  AND token = 'GbdQbxSA/4bDF+OG3fEnorhIIu1JWsI6WGz/uj74Pl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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