SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd009f40dfe57b8bd0a20c0a137b6a19a1b4087da935db973ed640342c08f09cb' 
  AND token = '8QxPgxFGZrOoBTHXeF/bL0bn5+GX2Uf2TOCJFNz/vOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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