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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0405f8ae30d00531396dbf45a1a1296477fba9d1a19c55a306b5faeaf9dcbe50' 
  AND token = 'TbBg5tr35I9JzA39zP+vlgCEtcEKl8WEYd37/QQ1vF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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