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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbf4f24dd75728083c2b93c9e87aac9c459620c74581353effcda2c81ae34c9b' 
  AND token = 'auP/dgQdSUbN0fj6xY9YJGhceX6drJd2Cz174AxpZNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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