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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2410fef36712a48ef176ba8d9525cb8129fc6db3afb985ad40ed3bd55945f968' 
  AND token = 'VcxUKdMl4C+YRz0JFkoTsC4EiZ6YEHM1lVc560LtzaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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