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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe9927342ecd7bc10078993fcb6f050921ee956c32e40223b42ea080517e75ab' 
  AND token = 'yk61D+crNGMgRKK2KqPgcH8eGBalQRi2og18l/Ei/P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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