Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a1c43a252877814be25b314d2ba882a7837954f0c1f2b7223bf3da74ea5ec60' 
  AND token = 'YAfCjledgcc6amaTyqMVu4SqZjPcmFxbKGMsRoZjAEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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