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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8ad81e237d24f8b9e32cdaba26c33dad8c38841dfc82cb659f6b4c651d071dd' 
  AND token = '6QwxS5005A2QjQVuXHtGmiieGo3ALVDrwnM8MnC0f6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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