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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d50a55c12cb2970d6644e5fb6570824af160c9ae4579d63bde7d5797b27ac94' 
  AND token = 'GZEGDeRfSUDdMTQax5UM72gnIV4hMmJEax3pEYId7bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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