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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3046dc7ef9c1d8fdfa70d4d0a73f850e9030dee9c246dde2e87a82c37d4a2e0f' 
  AND token = 'yHUZEcBnpBLHqmQnXNu5hIKrRst+iApWUvB5akjX/ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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