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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '582142bc5e3b8227abad07cd4a7df1883c2a0a1ec0ddb0c5049a565cfd4436ef' 
  AND token = 'gkH/PceUFmVTUQQDcNNmXBGBQ5s0FiI9m36KI/VTvko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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