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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ca2c00a92b3456e51770398555b158c99c58ef7452e4c50cabe04e48c6c76ae' 
  AND token = 'jllMM1/wXLhsA6Pv27WHR6v2HK6pmnj34nenGsx1K/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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