SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d25a706b44f85b5a94dd5ed3b0d8d6466daa91f2d779018e1887494df00c5af' 
  AND token = '2tpi/+SkKHf+Ejpj2TL2Too01/ujoUKBpKAvkxmxV3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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