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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd31253cd261204f93ac31254adf42d8f8f4e50805c042fbd1925c18f904d453e' 
  AND token = '62Mp9CpW3X3RRzVc5jnlxYJWY0vzYgThyevsLm0TPk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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