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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64d6406a2690ae79b929be2a846556d9c695c0f3f4d3f28f27518cba74fca43c' 
  AND token = 'j7xqxl+LI9YspWsWtC7lubi2OHH9knHhi8vlM2ed398=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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