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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '228cd2ba4e97a04bd1eb943b1140799fb9dc921c1a0ba82a7a4b68fcf97be67b' 
  AND token = '850kPPKqVXX5laJegJqZDZsyKR6e9TbioEkTjSvaQ3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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