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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ddfea9bc395a8350b968f32b7c622ef5f24b524b902acd99eccc2d6cc220267' 
  AND token = 'ZMSdO0tAaBQwfMc/C6cE47spvYzud+Q58JB4GH/1NJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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