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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ddced324a96f090c01b5a7ebe654e9564c9becee18b01c2116cae0d7bd19e3e' 
  AND token = 'LwgHfyiJnlnNbydeVCrFe2S2pe5vBbO9D25Vl1p4REU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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