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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f91bc9bd971c597fecfa0db80ce6e9b627448c8ef377b06a70f8611ef5161696' 
  AND token = 'jFftClMqUmI9fT1YWTVVOoh762fayVbqHljOUcHrefI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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