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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4fde28a255dce0f3ae3a7dbc6a89dcb235d2c1d790c8b53629f15ca594dad2d' 
  AND token = 'h4+o8buHMwP+fdqUqCz4PW3Rwfs0gcqyrR1Ziy0BGjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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