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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87cba331a8056197a2749febec7078de0c7e8c44f6f10c07aa85db2a0e2b55bc' 
  AND token = 'ftljFppe8fHQcBRACNN5HNs3cyff9n5mVXo5GCn5D2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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