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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81f34fe56bbe1a3e043c028fb4c4243a70306bdc4f37c42b7fb6b54e02b5ba8a' 
  AND token = '2CPteOXIZWjlda+LWyQTdkal0TAJREZCWDE4ayc9c2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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