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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a8ade9ce1d16bef67fbbb2ecef96225c1a4f2d3eb16eeb52d0ee1d916bea7b8' 
  AND token = 'Tq+CR2m73/Qzk28PVBXv/8KfALNTxbouTmgEVfjmFEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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