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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5dea6a9ca3e95b1f7cf4f4849461dc90d567f6bf167b717524b5cc0ed683160' 
  AND token = 'zQ4dAMcVmori+Dicz627be2jSdDIIm9uLhcYPiRB2eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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