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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69b4fd25636d2fb939b4b8c830b0430a8e1801652cd892b9de89396aa475011c' 
  AND token = 'PbiJO4Hn+baDKEkDS53dsxA8CkIfX0/UNhFkoglXwP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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