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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57f4b3bc6094f75abd97331c70b856a083f50d5910192dd87d2b8bc9b975de47' 
  AND token = '5s73Q5ko6QCOQF6cUX+warXhFKsGcBhUtrbxhMaQx3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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