SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8034fcd89403c26c25e313916abcbc9af9286d092bbaa66ac8aaf5ad15a52c10' 
  AND token = '+R8zq3bqTvWrR8O1vDRvbvM+73gzFhcKKuwg/nHzj1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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