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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fa6a58bb8d3dccd9337a2f149ce55fa2f20d0f7d7a90cb6041ea7e541d4ef34' 
  AND token = 'XfxqvEVgDBByKzlx68Q68SH6Bf7dScifIExd/sFXUaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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