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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca0aeb9f099fd44699fb0240929d0e6f21a7e977b20bb40ea92f5b8c6967e4b9' 
  AND token = 'XIVkfK8ZGfznA2x/2xb5zx4qOjK0D60isUBEayr/bbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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