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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63ffbfe83b5fc46e87a652bd8863a0ab92c168cb06609ea64c8658bdd4a0b85b' 
  AND token = 'QHDC8n2tdjtzvTHDdFsGOzHArgpwzfpxQXpcpUPrZgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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