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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16dc63fbabd12ed7c62565dabf4ff9bad4546e0ea5a0d9927269ae25a6db27ab' 
  AND token = '2JBT34EV2vm3DSLg1bPkE31kVJFQV+Xr7x69mvx1aVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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