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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dda883ac7dd978fcdeff5d9977d0386b2a164b397ae9f21de0405cb7acd3ac4e' 
  AND token = 'igUW0hqZLQD7DXdoBmS6kJd+6NeQoFb+tqh2LC1jiDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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