SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37cfcf58b6f9a37d440ccace362f9f8fe70434797832a48f90b174aefc8bffc2' 
  AND token = 'FCN5T4zhITNSLjx8tAS+p9vQDLpJKjZR3gOEBJH2mPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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