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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f84845ec156b099b396ac6f339d2f4f5743f3b7762e2977f89c7503f09934b7c' 
  AND token = 'dMHBoHr71x6QfJfT9+KgVe+j2KudoN0WROLJmN5LCA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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