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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72600359a593d4d04b9e8e73552b16f82e9f5fea92f029807fbf8fe6421c9b5e' 
  AND token = 'Ftn3AermXU9PYAl4nQ3vjzoI7DGoUf5Oo6Q06RuyGl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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