SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd34e1a7692e025f2712f9fb40296240381d5abc41c99457d1439ba31199096ae' 
  AND token = 'BTvIUWucrCPbqTb4bCtgVJ0ANLlhjmLV3kNzk6lwymQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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