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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '565300c83afacf21bef0df3c84b7b1a5bc6caa8a20630c9594e17b1003810e5b' 
  AND token = '76XrF7UNOM6dHllVOGRBmFfZcs+9uj4Rc21igBN88kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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