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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '138c05f48ba518be9b29c197dc0d3b09ef6edaa760f2f8d9613748dd182ac8aa' 
  AND token = '8axVfq7KfJFXpaVP4pdwgawXSMd78JRwSfX7ghUk8aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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