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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a95f6e9253e22d979ef38e4635ea41a29dbcde4f73cfbc45abced5b3fc4e673' 
  AND token = 'Kk6K/9xBBM5S241QgZW8dpGiD+Ruha/rpgPCWoKak3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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