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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c50db9683fd69efa08faabb5dc268e8062b5c164b921ced235c9af99796c3a7' 
  AND token = '0F2igzC+4GANfsAM96C8/qqxfU3Wku6MiQcP19fKp/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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