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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a02672e5a8cd5c93120f4188c1f71842243e54e94b6be2e6411da2502b84d8cb' 
  AND token = 'ZT9XxbXquz4Vzp5Las08S4wfx9Pp5Fnt8tZ1sVH756I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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