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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a50c0aeb15aec014f3682877c059e21e3a69d923003fd7044b831289730ea80' 
  AND token = '4v3EqISQ3onKDlYZsq9Y/gEarsMZI5TTFW1d4vi+O7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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