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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea87a0e9048cd831ff433cb7aec5948cc09c0dcb3bf78311028f3d367b2ffab9' 
  AND token = '6p5Zuc2SaTf/4NNg+kjydOQHju4ptMmZwtVBplWXYME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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