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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8b71cf68fb63439962babd72d7b7fb8816c8f88b0b2bc92aa4cc765bd021008' 
  AND token = 'VvDAaqfK1lxaGttOhmo0F9S5Jyjmjjt67pt0ZPht10U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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