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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a395ae5ae04768f083e8521456d87aaa71631aeb2770c616e23bcd9af5cdb0f0' 
  AND token = 'lqMpcxH8Yci20nJ+N8lWkRVxang78TebVC2K/0g/L7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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